powerpc/powernv: Check device-tree for RFI flush settings
commit 6e032b350c
upstream.
New device-tree properties are available which tell the hypervisor
settings related to the RFI flush. Use them to determine the
appropriate flush instruction to use, and whether the flush is
required.
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
parent
4b5158cefc
commit
5dc5971854
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@ -36,13 +36,62 @@
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#include <asm/opal.h>
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#include <asm/kexec.h>
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#include <asm/smp.h>
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#include <asm/setup.h>
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#include "powernv.h"
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static void pnv_setup_rfi_flush(void)
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{
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struct device_node *np, *fw_features;
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enum l1d_flush_type type;
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int enable;
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/* Default to fallback in case fw-features are not available */
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type = L1D_FLUSH_FALLBACK;
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enable = 1;
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np = of_find_node_by_name(NULL, "ibm,opal");
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fw_features = of_get_child_by_name(np, "fw-features");
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of_node_put(np);
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if (fw_features) {
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np = of_get_child_by_name(fw_features, "inst-l1d-flush-trig2");
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if (np && of_property_read_bool(np, "enabled"))
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type = L1D_FLUSH_MTTRIG;
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of_node_put(np);
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np = of_get_child_by_name(fw_features, "inst-l1d-flush-ori30,30,0");
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if (np && of_property_read_bool(np, "enabled"))
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type = L1D_FLUSH_ORI;
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of_node_put(np);
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/* Enable unless firmware says NOT to */
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enable = 2;
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np = of_get_child_by_name(fw_features, "needs-l1d-flush-msr-hv-1-to-0");
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if (np && of_property_read_bool(np, "disabled"))
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enable--;
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of_node_put(np);
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np = of_get_child_by_name(fw_features, "needs-l1d-flush-msr-pr-0-to-1");
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if (np && of_property_read_bool(np, "disabled"))
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enable--;
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of_node_put(np);
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of_node_put(fw_features);
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}
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setup_rfi_flush(type, enable > 0);
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}
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static void __init pnv_setup_arch(void)
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{
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set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
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pnv_setup_rfi_flush();
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/* Initialize SMP */
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pnv_smp_init();
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